Adjusting and engaging mechanism



Sept. 2, 1952 G. E. MEGEL ET Al; 2,608,879

' ADJUSTING AND ENGAGING MECHANISM Filed Oct. 16, 1950 lVENTORS GuRHaume EYnesY Mega Hanfl Marni-a. B LS AA; gawk Patented Sept. 2, 1952 ENGAG'IN or Moutier, Switzerland,

ation October 16, 1950, Serial No. 190,303

In Switzerland October 18, 1949 Applic 2 Claims. 1

Our invention relates to a tool holder for machine tools, in particular for automatic slicing lathes, including a support provided with means for securing the tool and pivotally mounted on a a slider carried in a slideway. According to a first object of our invention, there is provided on a longitudinal threaded rod projecting from the body of said slideway, a nut or the like screwing member carrying a ball bearing through the agency of which it abuts against the slider, whereby it is possible by screwing said screwing member over the said rod to shift the slider over the slideway in antagonism with the action of a spring.

Preferably, the screwing member is rigid with a wormwheel associated with a worm revolubly held in a carrier pivotally mounted on the slider, whereby the latter may be submitted to a coarse adjustment through direct actuation of the screwing member or else to an accurate adjustment by screwing down the screwing member through the agency of the wormgear considered when the carrier therefor is rocked into its operative position.

We have illustrated by way of example in accompanying drawings a preferred embodiment of our invention. In said drawings:

Fig. l is a side view, partly sectional, of a tool carrier.

Fig. 2 is a cross-sectional view through line IIII of Fig. 1.

Fig. 3 is a view from above of the part of the tool carrier illustrated cross-sectionally in Fig. 1.

The tool carrier according to Figs. 1 to 5 includes a slider l0 assuming cross-sectionally the shape of a U., Between the lateral flanges of said slider I0 is pivotally secured the actual tool holder ll assuming a shape similar to that described in the U. S. Patent No. 2,451,684 in the name of the assignee company, Usines Tornos, Fabrique de Machines Moutier S. A., at Moutier (Switzerland). The slider I0 is mounted on a slideway l2 and a longitudinal threaded rod I3, is screwed into the body of said slideway and extends through a bore provided in the rear downwardly directed portion a of the slider I0. Round said threaded rod 13 is provided a pressure spring l4 bearing on one hand on a collar provided on said rod and, on the other hand, on said rear depending portion of the slider l0, whereby the latter has a tendency to move outwardly under the action of the spring l4 considered. On the part thereof that projects beyond the slider II], the threaded rod engages a screwing member constituted by a nut IS on part Illa of the slider ll].

which is fitted a ball bearing 16 through the agency of which said screwing member [5 is adapted to urge forwardly the rear depending Thus, when screwing down the screwing member :5, the slider it is shifted back in antagonism with the spring l4 while conversely an unscrewing of said member [5 allows the spring to shift the slider in the opposite direction. The screwing member [5 is rigid with a coaxial worm wheel I50. forming a worm gear with a worm I! that is revolubly carried between the arms of a strap-shaped rockable carrier l8 pivotally secured to the rear end of the slider Hi. In the medial part of the carrier I8 is mounted a sliding centering pin l9 submitted to the action of the spring 20 and engaging when the carrier [8 is in its lower operative position, a flaring recess provided in a cooperating central portion of the head I5b on the nut l5, said central head portion assuming a square shape. For this operative position of the carrier l8, the worm l1 meshes with the worm wheel l5a whereby a rotation of said worm I! obtained through actuation of a knob 2|, provided on an extension of its stem, provides for the screwing or unscrewing of the nut [5 through the agency of the worm gear considered. On the other hand, when the carrier I8 is raised, it is possible to screw down or to unscrew the nut l5 directly by means of a wrench that it fitted when required over the central head section I51). Thus it is possible to provide for a coarse adjustment of the slider H) by producing directly a rotation of the nut l5 through such a wrench, or else it is 7 possible to provide for an accurate adjustment through a rotation of saidnut obtained through the agency of the worm gear. The nut 15 carries a coaxial socket 22 mounted with slight friction over said nut, said socket being provided with a peripheral wide flange carrying a scale cooperating with a mark carried by the adjacent surface of the slider Iii, said nut and associated parts forming an arrangement known per se in machine tools for returning to zero, whereby it is possible to read on the scale carried thereby the value of the adjustment obtained through rotation of the nut.

What we claim is:

1. In an engagement and disengagement device for a worm wheel, the combination comprising a housing, a worm wheel journaled in said housing, a nut member coaxially rigid with said worm wheel, said nut member including an axial polygonal section provided with a central depression, a worm member adapted to engage the 3 worm wheel, a carrier pivotally secured to the housing, said carrier pivotally carrying the worm in parallelism with its pivotal axis and including a bent portion registeringwith said nut member, a centering pin slidably carried by said bent portion adapted to engage said central depression in said nut when said worm member-of said carrier engages said worm gear, and spring means urging said centering pin into said depression. J i

2. A device as in claim 1, wherein'said carrier is pivotally mounted on a slider, whereby said slider may be adjusted in both coarse and fine adjustment in an automatic lathe by the adjustment of said nut ineniber and of said wormgear;

GUILLAUME ERNEST MEGEL HENRI MANCIA.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

